Subway Traction Power Supply System Based on PWM Rectifier

At present, PWM rectifier is widely used in various high power and high voltage situations because of its high energy, low harmonic content, constant voltage and bidirectional energy. The energy supply system of subway traction power supply system based on PWM rectifier shows the topology of a dual transformer with three winding transformers and four PWM rectifiers in parallel, which is superior to the modular model. Finally, the correctness of the control strategy is verified by Matlab/Initial simulation.

Analysis of compensating devices efficiency in ac traction power supply systems

The article describes the main methods of reactive power compensation used in 27.5 kV AC traction power supply systems on the railways of the Russian Federation. The cases of installation of the longitudinal and transverse capacitive compensation devices at traction substation and sectiolizing post are considered in this paper. Based on experimental data their effectiveness has been analysed by comparing the main parameters of the traction power supply system before and after the installation of the compensating devices. The main effect in terms of power consumption reduction is achieved through application of reactive power cross-compensation devices. The results of the analysis show that the total electricity consumption in the researched area decreased by 23 % and the proportion of higher harmonic elements of voltage decreased by 15 %.

The Study of the Effectiveness of Strengthening the Traction Power Supply System of the Northern Route of the Eastern Polygon of the Russian Railroads

The train-handling capacity of the limiting section of the traction power supply system of the Northern route of the Eastern polygon of the Eastern Siberian Railroad has been estimated, taking into account the prospective amount of traffic for 2025. Due to insufficient train-handling capacity of the section and inconsistency of voltage level in the overhead system, the parameters of traction power supply system operation mode were studied using the mathematical simulation method in the Fazonord software application and the mathematical simulation method in the Kortes software application using various technical means of amplification. The simulation results allowed us to determine the most optimal amplification methods that meet the task set. It was proved that the method of increasing the transmitted power from 220 kV power line to 110 kV line through the autotransformer installed for their connection at the new traction substation of the limiting long section corresponds to the purpose of ensuring the required trainhandling capacity of the limiting section in the best possible way, taking into account the prospects for development of both the external power supply system and the system of traction power supply. At one of the traction substations of the section under study it is required to install an additional power transformer for parallel operation. The specified combination of technical amplification means brings the parameters of traction power supply system into compliance with the requirements.

Research on New Rail Transit Power Supply System Scheme

The tourism rail transit project has broad development prospects in China. The new type of rail transit represented by trams and monorails is suitable for the demand of the project of the rail transit, and the traction power supply system is great significance for the normal operation of the new type rail transit. This paper introduces the external power supply, medium-voltage loop network and traction power supply of new type of rail transit project. Through the comparison of technical schemes, the selection for several important engineering schemes in the new rail transit power supply system engineering design are obtained.